These are great. I picked up 2 (each with 2 lasers (0.5mm diameter) They are not as sharp as the high end lasers but are great at closer ranges (under 30 feet) I just put one in my Stug III (where the IR light was) that I am in the process of converting to airsoft. I will get some pics and videos posted soon. I'm quite excited because this tank's gun was upgraded and shoots over 250fps (my strongest to date) The bb should have a pretty flat trajectory for at least 30 feet so this is where I'm going to set the aim for the laser.